An AP axial sacral projection obtained with a perpendicular central ray demonstrates
1)an elongated sacrum.
2)the sacrum and symphysis pubis without alignment.
3)a foreshortened sacrum.
4)the symphysis pubis superimposed over the lower sacral segments.
A) 1 and 4 only
B) 2 only
C) 3 only
D) 3 and 4 only

Question

Quizplus · Accepted Answer

A perpendicular central ray in an AP axial sacral projection will produce a foreshortened sacrum. The symphysis pubis will not be superimposed over the lower sacral segments, so option 4 is incorrect. Option 1 is incorrect because an elongated sacrum would be seen on a lateral sacrum projection, not an AP axial. Option 2 is incorrect because if the sacrum and symphysis pubis were not aligned, it would be due to improper patient positioning, not the central ray angle.

An AP Axial Sacral Projection Obtained with a Perpendicular Central